Dust of dark energy

By Eugene A. Lim, I. Sawicki, A. Vikman. 2010

225 citations recorded by the source corpus.

We introduce a novel class of field theories where energy always flows along timelike geodesics, mimicking in that respect dust, yet which possess non-zero pressure. This theory comprises two scalar fields, one of which is a Lagrange multiplier enforcing a constraint between the other's field value and derivative. We show that this system possesses no wave-like modes but retains a single dynamical degree of freedom. Thus, the sound speed is always identically zero on all backgrounds. In particular, cosmological perturbations reproduce the standard behaviour for hydrodynamics in the limit of vanishing sound speed. Using all these properties we propose a model unifying Dark Matter and Dark Energy in a single degree of freedom. In a certain limit this model exactly reproduces the evolution history of ΛCDM, while deviations away from the standard expansion history produce a potentially measurable difference in the evolution of structure.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/ea637641021c927e9e0e74e87343d82151fe6935

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Citations in the corpus

Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “2004b) or dusty dark energy (Lim et al. 2010), there is no sound horizon, just as for dark-matter dust, and in principle the dark energy clusters.”
The imperfect fluid behind kinetic gravity braiding (2011, background): “theories with kinetic gravity braiding. Having in mind the higher-derivative structure of the theory, it is interesting to speculate how one could change the ﬂuid picture using constraints as in Ref. [79]. It seems that, in particular, one could obtain a kinetically braided dust—a braided ﬂuid movin”
Imperfect Dark Energy from Kinetic Gravity Braiding (2010, background): “– 15 – theory comprising a single degree of freedom which is able to penetrate the phantom divide without classical instabilities is the so-called λϕ-fluid (“Angel Dust”) [89].”
Disformal transformations, veiled General Relativity and Mimetic Gravity (2014, methodology): “This action had already been exploited in [12] yielding a unification of Dark Energy and Dark Matter and was used in [13] to describe inflation, quintessence and bouncing nonsingular universes.”
Cosmology with Mimetic Matter (2014, background): “Consider the theory with the action (compare to [5])”
G-bounce (2011, background): “These theories can violate the NEC without any gradient instabilities [43] and can realise an oscillating nonsingular universe [44].”